Dual Network card Load balancing with VLAN

Posted on 2011-03-09
Last Modified: 2012-05-11
Hi I'm trying to cluster 2 windows 2008 web servers
I have 3 2008 servers one is the load balancing managemnt server and Domain controller the other 2 are web servers

I have 2 VLANS configured on the switch
I installed the newrk load balanciong manager on the three servers
I used the domain controller to set up and manage the load balancing
The problem is how does a pc not a member of the vlan connect to the cluster to access a site running on the cluster as the two servers can see each other and are allocated virtual ip addresses.

I know this question is long winded but are they any guides that show how to configure a load balancing vlan.
Question by:wjmorrow
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Expert Comment

ID: 35084195
Different ip ranges and subnets for devices on the seperate vlans too?
LVL 42

Expert Comment

ID: 35084414
If you are using Windows network load balancing the servers participating in the load balancing need two network cards each, and they share a virtual IP address and a Ethernet MAC address between them. As long as they are connected to the same VLAN and you configured the network load balancing you shouldn't need to do anything else on the network side.

Author Comment

ID: 35085384
thanks, How do you access the servers from outside the VLAN using the clusters IP address I thought that the second network card with the virtual IP addresses was only for private clustering based newtork traffic The clustered newtork card has three IP addresses the cluster shared IP Address and 2 other virtual IP addresses. I just want to know how to access the cluster from the other interface card.
Do I have to enable bridging or something?
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

LVL 42

Expert Comment

ID: 35086055
You just access the virtual IP. To try it, point your web browser at the virtual IP address. Shut down one of the nodes, it should still work. Power back on the node and shut down the other one. The web site should still work. I believe that the virtual IP will register in DNS, but you can create an A record in DNS if you need a different name.

Author Comment

ID: 35087015
the virtual ip address is mapped to the network card in the two port vlan. when i plug the network cards into the same vlan as the rest of the computers I can ping the virtual IP Address and connect to the servers so maybe you don't put the clustered adapters in a vlan of there own?

Author Comment

ID: 35087273
This link seems interesting

I have both the network cards configured on the same ip address range of dhcp of the domain controller and they are all on the same subnet, Do i have to set up a gateway address on the clustering cards
LVL 42

Accepted Solution

kevinhsieh earned 500 total points
ID: 35087470
A quick scan indicates that the documentation is pretty good. There is no requirement to have a VLAN or any other kind of separate network for wnlb. You can use a hub if you wanted to.

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